Dr. harrison finds that violent criminals are poor and live in cities. he concludes that poverty and urban residence cause violent crime. this conclusion:

This violates the principle of correlation not equaling causation. Just because the criminals are poor and live in cities does not mean these two factors are connected. There is no proof included that either living in a city or being poor causes violent crime.

6, 4, 5, 1 are true. the others are false.